1993 s-10 blazer starts fine when cold, but after warm up I ...

Is the check engine light come on when ignition is turned on and go off when started? does it come on again after runing?

check engine light comes on when key is turned to on, shuts off after running, and has not come on when running, however when I checked for codes with a jumper wire the 12 code flashed 3 times (normal) and then I got a 45x3, a rich mixture or O2, which was changed.The map sensor that was changed by Midas was changed again by me , along with the air temp. sensor.That seems to have cleared up the miss I was getting after a long run, but the hard start problem when warmed up has not.Could this be a distributor not advancing timing? I'm being told by auto parts staff that it is not the T.P.Sensor.I give up. Thats why I'm here. Thanks Customer (name blocked for privacy).

Have you checked the fuel pressure for leak down?Sound if as injectors may be leaking flooding cylinders.

Bill, why would leakdown only occur after reaching normal temp.? Shouldnt that show up right across the range? If you can explain that a little better I will accept your answer and check into the pressure idea.Thanks I hope. Customer (name blocked for privacy)

In cold start you require more fuel Than when hot, by depressing accelerated when starting your telling the ecm that the vehichle is flooded and to reduce fuel.does it put out black smoke when you start it warm?Once started i,m assuming it runs okay.You don,t have to accept unless your satisfied.If you want check it out first and get back to me.Was tps tested or was that someones opinion?